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NEET2005PhysicsMagnetic Effects of CurrentActual

A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity v as shown the force on the charge is:

Options

  1. Aalong y
  2. Bopposite y
  3. Calong x
  4. DOpposite x

Correct answer

A. along y

Step-by-step solution

According to Fleming's left hand rule direction of force is along y axis when is perpendicular to wire: F =Q( V B ) B due to I is acting inwards is into the paper, v is along or: array ll & F=a+ | array ccc i & h & k v & 0 & 0 0 & 0 & - B array | & F=Q+[-j(-v B)+0] & F=Q v B j array in y direction.

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